fix broken links to testgrid dashboard

[Aayush987]

What this PR does / why we need it:
Fixes a bunch of broken links to testgrid dashboard.

Which issue(s) this PR fixes:
This is related to an umbrella issue and fixes a task of the same:
kubernetes/test-infra#30370

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[neolit123]

thanks, we can close
#2917
too

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Aayush987, neolit123

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[neolit123]

/ok-to-test